<template>
    <el-menu default-active="1-4-1" background-color="#545c64" text-color="#fff" active-text-color="#ffd04b"
        class="el-menu-vertical-demo" @open="handleOpen" @close="handleClose" :collapse="isCollapse">
        <h3>{{ isCollapse ? '后台' : '通用后台管理系统' }}</h3>
        <el-menu-item @click="clickMenu(item)" v-for="item in noChildren" :key="item.path" :index="item.path">
            <i :class="`el-icon-${item.icon}`"></i>
            <span slot="title">{{ item.label }}</span>
        </el-menu-item>
        <el-submenu v-for="hasItem in hasChildren" :key="hasItem.path" :index="hasItem.path">
            <template slot="title">
                <i :class="`el-icon-${hasItem.icon}`"></i>
                <span slot="title">{{ hasItem.label }}</span>
            </template>
            <el-menu-item-group v-for="item in hasItem.children" :key="item.path">
                <el-menu-item @click="clickMenu(item)" :index="item.path">{{ item.label }}</el-menu-item>
            </el-menu-item-group>
        </el-submenu>
    </el-menu>
</template>

<script>
export default {
    data() {
        return {
            menu: []
        };
    },
    methods: {
        handleOpen(key, keyPath) {
            console.log(key, keyPath);
        },
        handleClose(key, keyPath) {
            console.log(key, keyPath);
        },
        clickMenu(item) {
            this.$router.push({
                name: item.name
            })
            this.$store.commit('selectMenu', item);
        }
    },
    computed: {
        noChildren() {
            return this.asyncMenu.filter(item => !item.children)
        },
        hasChildren() {
            return this.asyncMenu.filter(item => item.children)
        },
        isCollapse() {
            return this.$store.state.tab.isCollapse
        },
        asyncMenu(){
            return this.$store.state.tab.menu
        }
    }
}
</script>

<style lang="less" scoped>
.el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 400px;
}

.el-menu {
    height: 100%;
    border: none;

    h3 {
        color: #fff;
        text-align: center;
        line-height: 48px;
    }
}
</style>